Muffler



Oct. 23, 1928. 1,688,488

A. F. DORMEYER MUFFLER Original Filed June 21, 1.926

I Jrwwarzw- $536M 2 207777 6767? Patented on. 23, 1928.

UNITE STA ALBERT r. nonnnrnn, or CHICAGO, rumors.

murrnnn.

Application flled .Tune 21, 1926, Serial No. 117,294. Renewed March 19, 1928.

This invention relates to'a mufiler'which is particularly adapted for mufllflng the no se of exhaust gases from internal combustion engines and the like.

,5' One of the Objects of the present invention is to provide a simple, eliicient and economy cal construction of. a muflier.

Another-object of the invention 1s to providean improved mufiier which shall consist of a minimum number of parts, each of wh1ch may be stamped out of sheet metal at small cost, andall capable of being quickly and easily assembled togetherinto .the completed structure.

y A 'furtherobject is to provide a novel form of core. adapted to be made from flat metal strips formed to provide outwardly pro ecting baflling elements and capable of being positioned and secured within the shell of the mufiler.

, Astill further objectzof the invention is to provide a;novel muflier construction including a casing or shell formed with a plurality of peripherally arranged internal grooves for strengthening the shell and receiving and holding the circular baflies of the core mounted within the shell.

These and other objects are accomplished by providing a construction and an arrangevment of the various parts in the manner hereinafter described and particularly pointed out in the appended claims.

Referring to the drawings: 1 Fig. 1 is aside elevational view partl in cross section showing the construction 0 my improved form ofmuflier,

' Fig. 2 is an enlarged fragmentary cross sectional view taken on,v the line 2-2 in Fig. 1,

Fig. 3 is an enlarged cross sections. view arrangement of the apertures in one set of the bafiling elements.

jacent the exhaust end of the mufiler.

One of the advantageous features of any mufiier for reducing the noise of exhaust gases from internal combustion engines and the like is its simplicity madepossible by the factthat taken on the line 33 in Fig. 1 showing the taken on the line 4-4 in Fig.1 showing the,

construction of thelast bafiling elementad some instances are provided With peripheral grooves 12. These grooves, if employed, are disposed in spaced relation-longitudinally of the shell and in addition to strengthening the shell, are also adapted to receive and hold therein circular baiiling elements formed on the metal core in the manner hereinafter described. D

These semi-cylindrical shell sectionslO and 11- are provided at both ends with reduced cylindrical portions 13 and 14 which, in the interests of economy, are formed during the stamping operation. The end 13 is adapted to be connected with the exhaust pipe of the internal combustion engine and the other end serves as the exhaust end of the mufiier. Each of the semi-cylindrical shell sections 10 and 11 is provided along its longitudinal edges with laterally. extending flanges 15 and 16. These flanges 15 and 1:6 are'provided with ofl:' set portions 1] and 18, respectively, so as to form longitudinally extending sockets or.

grooves 19 and 20 to receive and retain therein the edges of the metal strips 21 and 22 of the baffling core. The offset portions 17 and 18 of the flanges 15 and 16, respectively, are in contacting relation and are secured togetherby soldering, welding, seaming or any othersuitable method so as to make the casing substantially gas-tight.

The bafliing core which is disposed within the shell comprises essentially a longitudinally extending web or body consisting of I one or more elongated sheets of meta-10f suitable width to fit within the shell. The baffling elements themselves consist of substans,

tial-ly semi-circular wings cut from the .body

or Web and bent at right angles thereto so as to be disposed transversely of the shell and divide the same into a series of battling chambers. -In the preferred construction illustrated, however, a larger number of bafliing elements and bathing chambers is secured by forming the web of two sheets of metal, inclicated by reference characters 21 and 22 respectively, which, after the baflfling elements" 25 and 26 are struck out from the ribs, are placed back to back, as shown on the draw ings, forming thereby a heavier and stronger web and also providing twice as many baffiing elements as could be struck out from a sin le sheet of metal.

i lternate baffling elements 25 are provided with a plurality of apertures 27 as shown in Fig. 3, and the intervening alternate elements 26 are provided with a central opening 28 as shown in Fig. 4. The last baffling element 30 at the discharge end of the muffler up the vbaflling elements.

is preferably provided with a large number in Fig. 5.

In the manufacture of my improved muffler, the casing sections, which are duplicates of each other, are stamped from sheet metal ofrelatively small apertures 29, as shown into the desired form having the contracted ends, and are provided during the stamping operationwith the circumferential ribs 12,

if these be employed. \Vhile the ribs 12 is also produced by a stamping operation.

In the preferred form illustrated WlllClLCOIlsists of two sheets of metal placed back to .back, each sheet is stamped to provide the requisite perforations and to cut and strike These sheets are then placed back 'to back to form the central web with the baffling elements projecting laterally from opposite faces thereof. The core thus constructed is then disposed within one of the shell sections and the other shell section isdisposed over the core and the two sections are then connected together along their edge to form an assembled, completed structure consisting in its entirety of but four pieces, all of which are produced by stamping operations. Each longitudinal, half of the muffler being a duplicate of the other -fiing chambers through which the exhaust gases must pass in a tortuous path, so as to reduce the back pressure and permit the ultimate discharge of the gases in a steady and noiseless stream.

' While in the above specification l have described one embodiment that my invention may assume in practice, it will, of course, be understoodthat the same is capable of modification andthat modification may be made without .departing from the spirit and scope of the invention as expressed in the following claims.

What I claim as my invention and desire 5O secure by Letters Patent is:

'1. A mufller construction comprising two semi-cylindrical members, said members having oppositely disposed laterally extending flanges formed integrallytherewith, a core mounted within the confines of said members comprising two longitudinally extending strips, oppositely disposed transverse bafiiing elements formed integrally with said strips,

and means whereby the longitudinal edges of .said strips are secured between the flanges of sald semi-cylindrical members.

semi-cylindrical members, mg oppositely disposed laterally extending flanges formed integrally therewith, said flanges having offset portions so as to form longitudinally extending recesses substansaid members havtially throughout the entire length of said mufller, and a bafiling core comprising two oppositely disposed metal strips having baffiing elements extending outwardly at right angles withrespect to each of said strips and 1n transverse alignment with respect to each other, said strips mounted in the recess formed between the flanges of said semi-cylindrical members for securing' said core within said members.

3. A mufiler comprising a shell and muffiing means therein including a diametrall disposed web extending longitudinally of the shell and transversely disposed baflie elements arranged in spaced relation, the edge of each element contacting with the inner periphery of the shell continuously from one diametrically opposed position therein to the other and dividing the interior of said shell into a plurality of bafiling chambers.

4. A muflier comprising ashell,and mufiling means within said shell including a longitudinally disposed web and transversely disposed mufiiing elements projecting laterally from both faces of said web, the edge of each ele- 2. A mufller construction comprising twoment contacting with the inner periphery of i said web andp'rojecting laterally from the opposite faces thereof, the edge of each eleing of a central web disposed longitudinally of the shell and transverse perforated baffling elements extending laterally from said Web, the longitudinal marginal edges of said web being secured between the opposing sections of said shell.

8. A muffler comprising a shell provided with circumferential.corrugations, and amuffier core comprising a. longitudinal web'provided with transversely disposed baffling elements having the outer edges thereof seated in the corrugations of said shell.

9. A muflier comprising a shell provided with circumferential corrugations, and a mufiling cor-e comprising a longitudinal web provided with transversely disposed semicircular. baftling elements having the outer edges thereof seated in the corrugations of said shell.

10. A muffler comprising a shell provided with circumferential corrugations, and a mufiling' core comprising a longitudinal web provided with transversely disposed baffling elements having the edges thereof continuously engaged in the corrugations of said shell from one diametrically opposed position therein to the other. 1

ner periphery of said shell from one edge of said web to the other.

12. A muffler comprising a shell,'and muffiing means within said shell including a lon gitudinally disposed web and transversely disposed mufiiing'elements projecting laterally from both faces of said web and arranged substantially perpendicular to the axis of the shell, the edge of each element contacting continuously with the inner periphery of said shell between opposite edges of said web.

13. A mufiier comprising a cylindrical shell, a web extending longitudinally thereof,

and baffling elements struck out from the body of said web and projecting laterally from opposite faces thereof, the edge of each element contacting continuously with the inner periph'ery of said shell between opposite edges of said web.

- 14;. A muffler comprising a shell provided with circumferential corrugations, and a muflling core comprising a longitudinal web provided with transversely disposed .bafiling elements having the edges thereof continuously engaged in the'corrugations of said shell between opposite edges of said web.

15; A muffler construction comprising two semi-cylindrical casing members, a baffling core mounted within the confines of said casing members and consistin of a longitudinal web having transverse ba es in spaced relation,'and means extending longitudinally of said casing members for securing said core 1 and said casing members together.

16. A mufller construction comprising two semi-cylindrical casingmembers, laterallyv extending flanges formed integrally with said casing members and a bafiiing core mounted within the confines of said casing members and consisting of a longitudinal ,web having transverse bafiies in spaced relation, said core being secured between the flanges of said casing members.

17 A muffler construction comprising a sectional conduit, a bafiiing core mounted within the confines of said conduit and consisting of a longitudinal web having transverse baffles in spaced relation, and means formed integrally with the sections of the conduit and engaging said core for securing said core and sections together.

18. A mufiler construction comprising two semi-cylindrical members each having oppositely disposed laterally extending flanges,

and a muftling core comprising anelement haying its side edges between said flanges of said members and having a portion forming a web directed longitudinally of said members and baffling elements secured to'said' .web and, extending to the interior walls of gitudinally of a portion of said shell parallel a plane containing the axis of the shell and partitioning said portion into separate parts, and bafile means secured to said longitudinally extending means directed transversely thereof at spaced intervals from opposite sides of said longitudinally extending means, said baflle means having perforations, the perforations of adjacent bafiles being of different size. v i I '20. A mufiler comprising'a generally cylindrical shell provided with a sem1-circum-.

ferential inwardly. opening slot intermediate its ends on one side and a. second semici'n cumferential inwardly opening slot spaced longitudinally from the first slot on the opposite side-of said shell, and a mufilingcore tially perimetrically extending recesses at longitudinally spaced intervals opening to the interior of the casing and a mufiiing core element in said casing, said core element havinga transversely directed web portion lying in a longitudinal plane through said 7 casing and a transverse baffle portion extending from eachside of the web portion into a recess in said casing adjacent the side of the web from which the baffle portion extends.

22. A mufiier comprising a longitudinal casing having transversely extending longi tudinally spaced, and inwardly opening recesses in the opposite Walls thereof, and core means in said casing comprising a transverse baflle having edge portions engaged in certain of the recesses in opposite Walls of the casing and having a portion between its said edge portions directed longitudinally of said casing.

23. A muflier comprising a longitudinal casing having transversely extending longitudinally spaced, and inwardly openin recesses in the opposite Walls thereof an core means in said casing comprising a transverse baflie having edge portions engaged in certain of the recesses in opposite walls of the casing and having a. portion between its said edge portions directed longitudinally of said casing, said. baffle having perforations between each of said edge portions and said portion thcrebetween.

In Witness of the foregoing I afiix my signature.

:ALBERT r. DORMEYER. 

